Cable-system-well-drilling tool.



E. L. H. COSBY.

CABLE SYSTEM WELL DRILLING TOOL.

APPLICATION FILED MAY 3, I916.

Pafitented Jan. 15, 1918.

VVITA/Z'S 5 has for time LEoPoLD HUGO. oosnY, oF-rILLMoRE, CALIFORNIA.

I App1icatio nfi1ed May3, 1916. i Seria1'1 1'.o.-.95,268.

Toa'll whom it may concern. H i

. Be it known that I, ERIC LQH. Coeer, a subject'of the King of Great Britain, residing at Fillmore, county ofyVentura, and State of California, haveinvented new and useful Improvements in Cable-System-\VelLDr-ilt ing Tools, of .which the following. is aspecification. l a This invention. relates tO IWell drilling tools,-and more particularly to well drilling tools for use in-astandard drilling-operations, that is, in drilling operations wherein a bit or string of tools is-reciprocated, as by means'of a cable or the'like. The invention its object-toprovide tools of-the general nature stated which will not be liable toparti due-to crystallization which frequentlyyoccursiin toolscas ordinarily constructed, due to the hammering, jarring and other vibrationimparting strains and stresses tov which well drilling tools are usually subjected; well drilling tools and parts thereof, when parted,gdue:to crystallization, or othercauses, frequently causegreatannoyan'ce to drillers as thelower portionsof the tools or string of tools will remainin the well hole and. it isnoeasy matter in many cases. tore'movethe same by-fishing methods, and such parting more frequently occursxat the .jO'lIIt-SVOf the tools than elsewhere, frequently the threaded 'portions breakinga way from thezothertportions with which they were originally: integrally formed, such breakage usually leaving the threaded portion of the tool which broke awayfrom its shankwith the portions of the string and the cable above such joint while the tool per se falls toi-the bottom of the well hole or remains at, the bottom in caseof breakage while initslowermost working position. i i In.accordance with the invention, an improved tool or tool joint, or tool portion is provided which is. composed of dissimilar materials or dissimilar grades of material such as different steels, themain portion of thetool or joint and its pin being formed of a suitable quality of steel and a core extending therethrough, and preferably from end to end thereof, being formed of a difl'erent or higher quality of steel, or built up of several diflerent grades of steel which prevents parting of the tool as simultaneous crystallization of the component parts of the tool is practically impossiblc; furthermore, the higher quality steel Specification of Letters Patent.

thread or threaded 'cAnLn-sYsTnM WELL-Intuitive TOOL.

Patented Jan. 15,]l9t8;

core willstrengthen the tool and a tool constructed of sei'eral different steels has great inherent. strength due to the mutual strengthening and supporting of the different steel members ofthe tool. Ordinarily, the metal ofwhich the screw pin or threaded end of the tool. is formed is more likely to crystallizegthan the metalor metals forming the reinforcing core. A particularly advantageousconstruction is to provide a bore through the tool or tool joint. such bore be? ing countersunk at its ends so that the core may be headed or riveted :over at both ends and overlap thesurrounding material of the basis metal of the tool] In certain applications of the invention to tools, it is desirable tohave onlythe top sect-ion of the tool organized in accordance with the invention in order to avoid extendingthe higher grade steel reinforcements throughout the length of the tool. Tools so organized may be builtup of i a reinforcedv section carrying the thread, which section may be welded to remaining portions of the tool. In a modified form the tool orthrcaded end portion there of may be built up of several concentric or otherwise disposed layers of steel or metals of grades different from the basic body metal, which different grades of metal would form the threaded portion and such metals may if desired be arranged inoverlapping relation to provide for greatstrength.

With the above and other objects in view, the invention consists in the novel and useful provision, formation, combination, association and relative arrangement of parts, members and features, all as hereinafter described, shown in the drawing, and finally pointed out in claims. i

In the drawing: Figure 1 is an end view of the threaded portion of an. oil welldrilling tool, .which portion is adapted to be welded to other or cutting or drilling portions of the tool;- i

Fig. 2 is a side elevation of the tool portionshown in Fig. 1; i

Fig. 3 is a view similar to Fig. l of a modified form of tool portion or joint;

Fig. 4 is a side elevation of the tool portion shown in Fig. 3; and

F 5 is a side elevation of a. still further modified form of the invention, a drilling bit being illustrated in this figure.

The parts in the various figures arc designated by reference characters.

Referring with particularity to the drawdifferent grade i aud'areheaded over at ing, in Figs. 1 and the body portion of a tool joint, which body portion is provided with a longitudinal bore at a and a and a, 6, 7, S and 9 designating respectively steel or, othe b'ers'of' metal dissimilar in grade or other the metal of thebody portion.

qualities to A, as for instance the members 6, 7 8 and 9 may bemade of higher grade steel or of steelzof great tensile strength and each-"of such members may if desired beformed of a of steel. The members 6, 7, S and 9 are preferably segmental in form their ends as-at 10 to till the countersinks a and a in the body portion A. it being understood that the members (ill the bore a. The member A is provided" with a threaded end portionaas at'll, the threadsbeing cut into the body portion A; g I 111 the form of the invention shown. in Figs. 3 aud t, a body portionB is provided and 'the same isbored from end to-endas at 7), the body portion B-comprising a tubular tool portion 12 ofbasic steel or other metal; concentric inserts 13 and l l of dissimilar gradesof steel or the like being provided in-the'bore I), the outer insert 13 being provided witha bore 13 into which the insert 14 is'fitted. The threaded end I) of the tool portion is formed preferably as a taper jointand the same may comprise threads, portions of which are formed on each or on more than one of the members of the tool portion; I

.In the form ofthe invention shown in Fig' 5,'-C--designates a drilling bit bored from end to end as at 0 and provided in such ibore with a. core 0 which may be formed of segments of varying grades of steel or of a bar of steel of a' different grade from that of which the main body C of the bit is formed. It will be understood that in the form 'ofthe invention now being described the reinforcing or central-core of the tool extends from end to end of the tool and the same may be headed over at the end of the threaded portion 0 of thetool and at thelower end thereof as at 0",this construction differing in the mainyfrom the construction "described in connection with the other figures, in that such other embodi- (topic! 0 thin potent my be obtllned. for live cents each,bya.dg1ressing the commissioner of Patents ,1

2 thereof A designates countersunk at its ends as at 1' metal reinforcing memthreaded pin ments of the invention, only a portion of the tool, namely, the threaded end portion is formed in accordance witlrthe invention.

'lheadvantages and method of use of the invention will 'lie'readily understood from the foregoing description, takeninconnection with the accompanying drawing and the following statement:

The core of steel of a grade diiferent from the basic metal-of the tool inany of vthe forms of the invention will prevent parting of the'tool at the basexo f the thread ms crystallization of the basic metal and l crys tallization of the core could not oc curl sis multaneously; thus should the basic metal artat theibase of the thread, the-:toolwill be held together, due to the still t n/crystal? l ized longitudinal coreg'furthermore in tools so: constructed ofdissimilar steelscrystalli:

za'tion is not as apt to occur,idueitothemu tua'l reinforcement and strengthening of the toolbyitscompone'ntparts;..

' Having thus i disclosed my anve'ntion,

claim and desire xto secure by Letters i, 5,? 111:,- ,i Ina tool, a body' having a threaded end and a: core of dissimilar material where by said body and 7 held together in case of crystallization. i: In a -tool;1 abody portion-"of. suitable material having a: threaded end, and: a rein forcing core extending. through said thread ed end and into said body saidireinforcing said threaded end. may be core being ofhigher gradeflmaterialxthan saidbody. 1 v

1; 31: 1,}1" a tool :of' the character disclosed, a body portion, a a threaded portion, and. .a member-"of material different from said body portion uniting said threaded "portion with said body portion; is

4. In atool-joint'ya body portionlanda comprising: in part higher grade material than ithe-material of said body portion 'whereby separation of said threaded pin and said body portion, .'due' to crystallization is prevented. i V 1 5. Ina tool joint, abodyportion, and a threaded pincomprising in part material. of a'grade'different from the basic materialof said body portion and whereby separation of said pin and said body portion dueto crystallization .is prevented. i

ER-1C LEOPOLD HUGO COSBY.

,. washin tmm. 0.9-. L 

